2f+3.9=9.9

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Solution for 2f+3.9=9.9 equation: 



2f+3.9=9.9

We move all terms to the left:

2f+3.9-(9.9)=0

We add all the numbers together, and all the variables

2f-6=0

We move all terms containing f to the left, all other terms to the right

2f=6

f=6/2

f=3

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